do not store value on the getter instance, we do not have

an instance per portal type. Probably the best way to
cache the value would be to have one getter instance per
portal type

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30751 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Accessor/Interface.py

@@ -54,9 +54,4 @@ class Getter(Accessor):
     self._key = key
 
   def __call__(self, instance):
-    value = self._value
-    if value is None:
-      # Store the value for performance
-      value = instance.provides(self._key)
-      self._value = value
-    return value
+    return instance.provides(self._key)